Question

10. A person purchased 10 dozen pens at the rate of 40 per dozen. On checking, he found that 20 pens were
not working. In order to earn 25% profit, at what price should he sell each pen?​

Answer 1

Step-by-step explanation:

10 dozen pens=10×12=120

Rate of per dozen Rs 40

Rate of per pen=40/12=20/6

Out of 120 pen 20 pens not working.

100 pens working.

Price of 100 pens=20/6×100

=333.3

=Rs 334

25% profit=25/100×334

=83.5

=Rs 84

25% profit on 100 pens=334+84

=Rs 418

25% profit on each pen=418/100

=4.18

=Rs 5

He should sell each pen at Rs 5.

Answer 2

Answer:

Rs.5

Step-by-step explanation:

CP of 1 pen = Rs 400

SP of 100 pens = 100 + profit% divided by 100 x CP

= 100 + 25% divided by 100 x 400

125 divided by 100 x 400

= 500

SP of each  pen = 500 divided by 100

                           = Rs.5